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Dortmund know that they are entering dangerous territory if they allow the youngster to enter the final two years of his contract without inking an extension - having previously been stung by Robert Lewandowski walking away from the club for nothing and Nuri Sahin leaving for a greatly reduced fee also.

They have already begun discussions with the Pulisic family over fresh terms.

According to SportBild Bayern bosses are keen on plundering Dortmund once more this summer, as they seek to replace veteran duo Arjen Robben and Franck Ribery.

Club chiefs Uli Hoeness and Karl-Heinz Rummenigge are actively seeking to bring down the age of the squad, with Arturo Vidal also potentially exiting when the 2017-18 campaign ends.

Bayern sold Douglas Costa last summer, while Robben and Ribery’s deals both expire in the summer. The Dutchman is expected to sign an extension, but Ribery could move to the Middle East.

But they aren’t the only Premier League side keeping abreast of his situation, with Manchester United also monitoring his progress.

Jose Mourinho has added Alexis Sanchez to his attack this month but United are already making plans for more big-money moves this summer - particularly with Zlatan Ibrahimovic set to depart for America.

Additionally, for both United and Liverpool's American owners, Pulisic is seen as a huge addition from a commercial point of view.

He has already been described as football's "first American superstar" and his appeal in his homeland is only set to grow in the coming years.